71315520 has 56 divisors (see below), whose sum is σ = 226429824. Its totient is φ = 19017216.

The previous prime is 71315507. The next prime is 71315549. The reversal of 71315520 is 2551317.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36184 + ... + 38103.

Almost surely, 2^71315520 is an apocalyptic number.

It is an amenable number.

71315520 is an abundant number, since it is smaller than the sum of its proper divisors (155114304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71315520 is a wasteful number, since it uses less digits than its factorization.

71315520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74307 (or 74297 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 71315520 is about 8444.8516860866. The cubic root of 71315520 is about 414.6942539220.

Adding to 71315520 its reverse (2551317), we get a palindrome (73866837).

The spelling of 71315520 in words is "seventy-one million, three hundred fifteen thousand, five hundred twenty".